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AmyIsBadAtCoding
AmyIsBadAtCoding wrote ...

2019/5/31

Hey, just wondering how to make counter work across lost of worlds

AmyIsBadAtCoding AmyIsBadAtCoding

2019/5/31

#
Already asked but to make it clear: the other person had a TOTALLY different game so the code is different. Keep in mind I also want to make it so the higher the counter is the faster the enemy goes-I would like access to the 'target' variable in other worlds so I can do this please. Am using 2.4.1 which is my school version btw. The counter code is the same as default but I'll give you it anyway:
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import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.awt.Color;
 
/**
 * A Counter class that allows you to display a numerical value on screen.
 *
 * The Counter is an actor, so you will need to create it, and then add it to
 * the world in Greenfoot.  If you keep a reference to the Counter then you
 * can adjust its value.  Here's an example of a world class that
 * displays a counter with the number of act cycles that have occurred:
 *
 * <pre>
 * class CountingWorld
 * {
 *     private Counter actCounter;
 *    
 *     public CountingWorld()
 *     {
 *         super(600, 400, 1);
 *         actCounter = new Counter("Act Cycles: ");
 *         addObject(actCounter, 100, 100);
 *     }
 *    
 *     public void act()
 *     {
 *         actCounter.setValue(actCounter.getValue() + 1);
 *     }
 * }
 * </pre>
 *
 * @author Neil Brown and Michael Kölling
 * @version 1.0
 */
public class Counter extends Actor
{
    private static final Color transparent = new Color(0,0,0,0);
    private GreenfootImage background;
    private int value;
    private int target;
    private String prefix;
     
    public Counter()
    {
        this(new String());
    }
 
    /**
     * Create a new counter, initialised to 0.
     */
    public Counter(String prefix)
    {
        background = getImage();  // get image from class
        value = 0;
        target = 0;
        this.prefix = prefix;
        updateImage();
    }
     
    /**
     * Animate the display to count up (or down) to the current target value.
     */
    public void act()
    {
        if (value < target) {
            value++;
            updateImage();
        }
        else if (value > target) {
            value--;
            updateImage();
        }
    }
 
  /**
     * Add a new score to the current counter value.  This will animate
     * the counter over consecutive frames until it reaches the new value.
     */
    public void add(int score)
    {
        target += score;
    }
 
    /**
     * Return the current counter value.
     */
    public int getValue()
    {
        return target;
    }
     
     
    /**
     * Set a new counter value.  This will not animate the counter.
     */
    public void setValue(int newValue)
    {
        target = newValue;
        value = newValue;
        updateImage();
    }
     
    /**
     * Sets a text prefix that should be displayed before
     * the counter value (e.g. "Score: ").
     */
    public void setPrefix(String prefix)
    {
        this.prefix = prefix;
        updateImage();
    }
 
    /**
     * Update the image on screen to show the current value.
     */
    private void updateImage()
    {
        GreenfootImage image = new GreenfootImage(background);
        GreenfootImage text = new GreenfootImage(prefix + value, 22, Color.BLACK, transparent);
         
        if (text.getWidth() > image.getWidth() - 20)
        {
            image.scale(text.getWidth() + 20, image.getHeight());
        }
         
        image.drawImage(text, (image.getWidth()-text.getWidth())/2,
                        (image.getHeight()-text.getHeight())/2);
        setImage(image);
    }
}
danpost danpost

2019/5/31

#
What do you have in your other classes dealing with Counter objects?
AmyIsBadAtCoding AmyIsBadAtCoding

2019/6/10

#
I believe this Plane class is the only one that deals with the counter:
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import greenfoot.*;
 
/**
 * Write a description of class Plane here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class Plane extends Actor
{
/**
 * shrinking plane size
 */
    public Plane()
    {
     GreenfootImage image = getImage();
        image.scale(image.getWidth() - 60, image.getHeight() - 60);
        setImage(image);
        }
     
    
    private Counter counter;
/**
 * adding up-down controlls and if the actor touches the right side they will go to a random world
 */
    public void act()
    {
     
        {
            setRotation(0);
            move(2);
    }
        if (Greenfoot.isKeyDown("Up"))
    {
            setRotation(-20);
            move(2);
    }
    if (Greenfoot.isKeyDown("Down"))
    {
        setRotation(50);
            move(2);
        }
    if (getX() == getWorld().getWidth()-1)
    {
        if (Greenfoot.getRandomNumber(3)==0)
        {
            Greenfoot.setWorld(new SkyEnemy());
    }
       if (Greenfoot.getRandomNumber(3)==1)
       {
           Greenfoot.setWorld(new SkyEnemyTwo());
        }
        if (Greenfoot.getRandomNumber(3)==2)
        {
            Greenfoot.setWorld(new SkyEnemyThree());
        }
    }
    /**
     * plane can collect ball, play sound and add 1 to counter
     */
    Actor Ball = getOneObjectAtOffset(0,0,Ball.class);
    if (Ball != null)
    {
        getWorld().removeObject(Ball);
        Greenfoot.playSound ("Coin-collect-sound-effect.mp3");
        counter.add(1);
    }
}
/**
 * counter code
 */
public Plane (Counter pointcounter)
{
    this();
    counter = pointcounter;
}
}
danpost danpost

2019/6/10

#
AmyIsBadAtCoding wrote...
I believe this Plane class is the only one that deals with the counter: << Code Omitted >>
You probably also create a Counter object in you World subclass and do stuff with it there (show code).
AmyIsBadAtCoding AmyIsBadAtCoding

2019/6/11

#
Heres one of the world codes, the only differences between the other worlds and this one is the enemy planes and balls(things you collect) spawn and where they spawn.
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import greenfoot.*;
 
/**
 * Write a description of class Sky here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class Sky extends World
{
     
    /**
     * Constructor for objects of class Sky.
     *
     */
    public Sky()
    {   
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1);
 
        prepare();
         
    }
     
    /**
     * Prepare the world for the start of the program. That is: create the initial
     * objects and add them to the world.
     */
    private void prepare()
    {
        Counter counter3 = new Counter();
        addObject(counter3, 66, 33);
        Plane plane3 = new Plane(counter3);
        addObject(plane3, 12, 227);
    }
danpost danpost

2019/6/11

#
I think if you just make the Counter field in your Plane class public static (line 22):
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public static Counter counter;
then, in all your other worlds (other than Sky), you can just create a Plane object without having to worry about the counter. That is, use new Plane() and add the plane and counter into the world:
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addObject(new Plane(), << x, y >>);
addObject(Plane.counter, << x, y >>);
AmyIsBadAtCoding AmyIsBadAtCoding

2019/6/12

#
Since my counter variable is called counter3, would I put
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addObject(new Plane(), << x, y >>);
addObject(Plane.counter3, << x, y >>);
danpost danpost

2019/6/12

#
AmyIsBadAtCoding wrote...
Since my counter variable is called counter3, would I put << Code Omitted >>
It is not called counter3 (at least, not in the Plane class).
AmyIsBadAtCoding AmyIsBadAtCoding

2019/6/12

#
Now it's throwing a hissy fit, the world constructor threw an exception. It doesn't like lines 21 and 44 saying: java.lang.NullPointerException
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import greenfoot.*;
 
/**
 * Write a description of class SkyEnemy here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class SkyEnemy extends World
{
 
    /**
     * Constructor for objects of class SkyEnemy.
     *
     */
    public SkyEnemy()
    {   
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1);
 
        prepare();
    }
 
    /**
     * Prepare the world for the start of the program. That is: create the initial
     * objects and add them to the world.
     */
    private void prepare()
    {
        BadPlane badplane = new BadPlane();
        addObject(badplane, 520, 96);
        badplane.setRotation(90);
        badplane.setRotation(180);
        badplane.setLocation(524, 77);
        badplane.setLocation(521, 66);
        removeObject(badplane);
        BadPlane badplane2 = new BadPlane();
        addObject(badplane2, 595, 92);
        badplane2.act();
        badplane2.setRotation(180);
        Ball ball = new Ball();
        addObject(ball, 321, 346);
        addObject(new Plane(),  17, 204 );
        addObject(Plane.counter,  66, 33 );
    }
}
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